“I think the president is just frustrated here, and I get that,” Collins added. “I’ve wanted Mueller to come before the committee all along. Then I can ask [Mueller] about how this investigation got started in the first place, what he was told about how it all began.”

Collins had previously urged Democrats to quickly call Mueller to the Capitol—even suggesting last month that they cut short a two-week recess to hear from the special counsel about his findings, Politico reports.

“I think we can agree this business is too important to wait, and Members of the Committee will surely return to Washington at such a critical moment in our country’s history,” Collins wrote at the time,—a plea that was rejected by the committee Chairman Jerrold Nadler (D-New York) as premature.

In private, several top House Republicans believe it would be a mistake for Trump to prevent Mueller from appearing before the Judiciary Committee. To these GOP lawmakers and aides, that would allow Democrats to focus on the issue of Mueller’s non-appearance rather than the findings in his report.